Weldability analysis of stainless steel sheet
The physical characteristics and shape of stainless steel sheet directly affect weld quality. Stainless steel sheet has small thermal conductivity and large linear expansion coefficient. When the welding temperature changes quickly, the thermal stress is large, and it is easy to burn through, bite edge and wave deformation. Stainless steel sheet welding with plate butt welding of molten pool is mainly influenced by arc force, molten pool of metal effect of gravity and molten pool of metal surface tension, when the volume of molten pool of metal, quality and weld width, the depth of molten pool depends on the size of the arc, and arc force and depth of molten associated with welding current, weld width is determined by the arc voltage.
Molten pool, the greater the volume is, the greater the surface tension when cannot balance the arc surface tension force and molten pool of metal, gravity will cause the molten pool burning through, and local heating and cooling in the process of welding, the welding produce non-uniform stress and strain, when weld longitudinal shortening on the plate edge stress exceeds a certain value, can produce serious wave deformation, The shape quality of the workpiece is affected. Under the same welding method and technological parameters, using different shapes of tungsten poles can reduce the heat input of welded joints, which can solve the problems of weld penetration and workpiece deformation.